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건강Chronic
[건강]Chronic Diseases, Elderly People, and Immunity Before Corona Vaccination
![[건강]Chronic Diseases, Elderly People, and Immunity Before Corona Vaccination](https://cdn.getnews.co.kr/news/thumbnail/202102/513247_199992_2228_v150.jpg "[건강]Chronic Diseases, Elderly People, and Immunity Before Corona Vaccination")